Enable DISTRO_DEFAULT on platforms that missed it before

A number of platforms had been using the distro default feature before
it was moved to Kconfig but did not enable the new Kconfig option when
it was enabled.  This caused a regression in terms of features and this
introduces breakage when more things move to Kconfig.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/smdk5420_defconfig b/configs/smdk5420_defconfig
index 8715ec3..2141270 100644
--- a/configs/smdk5420_defconfig
+++ b/configs/smdk5420_defconfig
@@ -4,14 +4,13 @@
 CONFIG_TARGET_SMDK5420=y
 CONFIG_IDENT_STRING=" for SMDK5420"
 CONFIG_DEFAULT_DEVICE_TREE="exynos5420-smdk5420"
+CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT=y
 CONFIG_FIT_BEST_MATCH=y
 CONFIG_SILENT_CONSOLE=y
 CONFIG_CONSOLE_MUX=y
 CONFIG_SPL=y
-CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="SMDK5420 # "
-CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_MMC=y
 CONFIG_CMD_SF=y
@@ -20,16 +19,9 @@
 CONFIG_CMD_USB=y
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
-CONFIG_CMD_DHCP=y
-CONFIG_CMD_MII=y
-CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_TIME=y
-CONFIG_CMD_EXT2=y
-CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
-CONFIG_CMD_FAT=y
-CONFIG_CMD_FS_GENERIC=y
 CONFIG_DM_I2C=y
 CONFIG_DM_I2C_COMPAT=y
 CONFIG_SPI_FLASH=y